Can someone tell me about the car a little.

Also tell me about the brakes it has etc...? How much better over a reguar zcoupe and what differences are ?

www.bmwusa.com

It has ALL the information you're looking for.

Z4 coupe comes with 3.0 engine produce 255 hp. Z4M coupe comes with 3.2 engine produce 330 hp.
Z4 coupe comes with both 6 speed manual trans and 6 speed steptronic while Z4M coupe comes with onlye t speed manual with hevy duty clutch.
Brake size for the Z4m is 13.6'' front and 12.9" rear, I'm not sure about Z4 coupe.

so the Z4M has the same motor as a e46 M3 ?

ok got it its got the s54

cool!